Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef8a51c2b555f4952d92b7fe24f14e86dd19b6e0dc56b284fe4c561b7c34dcc' 
  AND token = 'o/f/3eCVdfdVcUMZ2NyObSaZusxMjd5sKvTO7WdbW4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}